CVE-2022-48705

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

wifi: mt76: mt7921e: fix crash in chip reset fail

In case of drv own fail in reset, we may need to run mac_reset several

times. The sequence would trigger system crash as the log below.

Because we do not re-enable/schedule "tx_napi" before disable it again,

the process would keep waiting for state change in napi_diable(). To

avoid the problem and keep status synchronize for each run, goto final

resource handling if drv own failed.

[ 5857.353423] mt7921e 0000:3b:00.0: driver own failed

[ 5858.433427] mt7921e 0000:3b:00.0: Timeout for driver own

[ 5859.633430] mt7921e 0000:3b:00.0: driver own failed

[ 5859.633444] ------------[ cut here ]------------

[ 5859.633446] WARNING: CPU: 6 at kernel/kthread.c:659 kthread_park+0x11d

[ 5859.633717] Workqueue: mt76 mt7921_mac_reset_work [mt7921_common]

[ 5859.633728] RIP: 0010:kthread_park+0x11d/0x150

[ 5859.633736] RSP: 0018:ffff8881b676fc68 EFLAGS: 00010202

......

[ 5859.63376

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References